Welcome to the Workshop community @arashid. I'd be happy to assist with your question.
By the time the chipboard has swollen to the degree pictured it is so degraded that there is no fixing it. The glue holding the board together has deteriorated and will continue to do so. My advice would be to look at replacing the drawer fronts if the rest of the vanity is in good condition. If the vanity is aged I would suggest the possibility of replacing it entirely.
If you required further assistance or had additional questions, please let me know.
Thanks a lot for ur support. There is no problem with the rest of vanity. From where we can get the drawer front of same size can u please advise on this.
Great will have a look. One more thing is there a way to stop it from happening. Means if it just starts to happen is there anything can we apply on it to stop further destruction.
This issue happens when water penetrates the corners and edges of the coating applied to the inner timber. Kaboodle drawer panels have a thermal vinyl coating with no exposed corners to prevent this from happening. The best way to stop it from happening on other brand products is to prevent water from sitting on the surfaces. Once the inner timber is exposed you could try painting it to assist in stopping it progression further.
In the Kaboodle range, they have "J-pull" drawer panels. Here's an example of Kaboodle 450mm Coconut Milk J-Pull Drawer Panels 4 Pack.